The cracking noise under the seat of your Super Splendor bike while driving, especially on village roads, could be due to several reasons. Here are some potential causes and solutions:

1. **Loose or Dry Seat Clamp**: Ensure the seat clamp is tightened to the correct torque. If it is loose or dry, apply some grease or carbon fiber grip to the metal or carbon surfaces to prevent creaking[5>.

2. **Saddle Rails**: Check if the saddle rails are creaking where they clamp to the seat post. Apply some grease or spray lubricant like G35 to the rails and clamp area[5>.

3. **Seat Post**: If the seat post is metal on metal, use the correct grease. For carbon seat posts or frames, use fiber grip. Ensure the seat post is clean, and the seat clamp is torqued properly[5>.

4. **Frame or Seat Post Damage**: Inspect the frame and seat post for any cracks or damage. If found, it may require replacement[4>.

5. **Bottom Bracket**: Although less common in motorcycles, if applicable, ensure the bottom bracket bearings are smooth and well-greased. However, this is more relevant to bicycles[5>.

It is recommended to get your bike physically inspected at the nearest authorized service center for a thorough diagnosis and repair.